西湖凹陷中南部 H 构造断裂发育特征及控藏作用.

The H structure is located in the central and southern part of the Xihu Depression central depression structural belt, adjacent to the hydrocarbon-rich Shaoxing 36 depression and divided by multiple faults as a structural trap, which has good conditions for hydrocarbon accumulation. However, currently, the research on faults in this structure is relatively weak, which restricts the exploration of hydrocarbon potential. To clarify the development characteristics of faults and their control over hydrocarbon accumulation, this article starts from 3D seismic data interpretation and drilling data, analyzes the development characteristics and evolution process of H structural faults, conducts research on the control of faults on hydrocarbon accumulation within the structure, and divides hydrocarbon accumulation types. Research shows that the faults within the H structure mainly developed in the Paleogene, the dominant trend was NNE. The faults can be divided into two hierarchical class: source rocks-linking faults and regulative faults. Among them, F1 and F4 faults located on the east and west sides of the structure control the formation of the structure, and fault activity controls the ancient high point. The fault level and fault sand coupling degree can control the abundance of hydrocarbon. Based on the comprehensive analysis of fault activity, source-fault combination types, and transportation models, two hydrocarbon accumulation models were established, providing guidance for the next step of oil and gas exploration in this structure. [ABSTRACT FROM AUTHOR]